Undercutter-support.



No. 830,238. PATENTED SEPTA, 1906.

F. H. LAMB.

UNDERGUTTER SUPPORT. APPLICATION FILED 1350.23, 1905.

JNVENTOR im/x mm UNITED STATES PATENT QFFIGE.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed December 23,1905- Serial No. 293,136.

To all when it may concern:

Be it knomi that I, FRANK H. LAMB, a citizen of the United States,residing at H0- quiam, in the county of Chehalis, State of Washington,have invented certain new and useful Improvements inUndercutter-Supports, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to an undercuttersupport for saws, andparticularly to an improved construction and arrangement of thesupporting-arm and means for adjustably clamping the same upon theholding-dog.

The invention has for an object to provide an improved construction ofclamp by which the supporting-arm carrying the bearingwheel for thesawis adj ustably mounted upon a dog and may also be reversed inposition, so as to bring said wheel above the horizontal plane of saiddog and permit a continued sawing action.

Other and further objects and advantages of the invention will behereinafter set forth, and the novel features thereof defined by theappended claims.

In the drawings, Figure 1 is a perspective of the invention applied inposition for use Fig. 2, a vertical section thereof; Fig. 3, a detailelevation of one of the friction-washers Fig. 1, a similar view of thecooperating washer, and Fig. 5 a plan of the holding-nut.

Like numerals of reference indicate like parts throughout the severalviews of the drawings.

The numeral 1 designates a dog, which may be of any desired constructionor configuration and provided at its inner end with a sharpened portion2 for insertion into the log or other object to be sawed from the underside. The outer end 3 of this dog is pro vided with an aperture 4,through which the threaded shank 5 of the eyebolt6 is adapted to pass.This bolt is provided with an aperture 7 in the body thereof, throughwhich the circular supporting-arm S for the saw passes to permit alateral adjustment therein. This supporting-arm is provided at its lowerportion with a lug 9, provided with a journal 10 at its outer end toreceive the saw-wheel 11, which is held in position thereon by theclamping-nut 12. This wheel is provided upon its periphery with one ormore grooves 13, in which the back of the saw is adapted to rest, asshown by dotted lines in Fig. 2, so

that the teeth thereof are uppermost and adapted to engage the underedge of a log or timber as the wheel is adjusted relative thereto.

The vertical adjustment of the arm 8 upon the dog is effected by meansof the bolt 6 and the friction-washer 14, having a central aperture 15adapted to fit over the body of the bolt, as shown in Fig. 2, and withthe recessed face 15, provided with curved walls to receive thesupporting-arm S and by frictional engagement therewith clamp it inadjusted position. The opposite face of the washer 1 1 is provided witha beveled recess 17, Fig. 2, into which the beveled edge 18 of the clamping-washer 19 is adapted to fit. This Washeras shown in Fig. 4, isprovided with a central aperture 20, adapted to fit over the shank ofthe bolt and with an angular recess or seat 21 extending across theouter face thereof, in which the edges of the dog 1 lie, so as tosupport the members against any rotary movement relative to the dog andyet permit the horizontal adjustment thereof. For the purpose ofclamping these washers and the several parts controlled thereby intofirm contact for retaining the saw-supporting wheel in adjusted positiona nut 22 is threaded upon the shank 5 of the supporting-bolt 6 andprovided with an operating-handle 23, by which it may be convenientlyrotated.

This invention is particularly adapted for use by sawyers in lumberingin the woods for supporting the saw while making a out upon the underside of a log with the toothed edge of the saw uppermost, and thereforeprovides a simple, light, and efficient device for sup porting the backof the saw and permitting an upward feed thereof during the progress ofthe saw through the log. This adjustment upward is made with the partsin the position shown by full lines in Fig. 1 until the wheel reachesits uppermost adjustment below the holding-bolt, and the arm is thenreversed in position, so as to bring the wheel above the dog, and acontinued upward adjustment is permitted, as shown in Fig. 1, thusavoiding the necessity of removing the dog from position and permittinga continu ous sawing through the log. It will also be noted that inaddition to the vertical adjustment of the saw-supporting arm a lateraladj ustment of this arm upon the dog is permitted by means of thefrictional clamping means hereinbefore shown and, described.

IIO

Having now described the invention and set forth its merits, what isclaimed, and desired to be secured by Letters Patent, is

1. An underouttensupport comprising a dog adapted for insertion in thematerial tobe sawed, a supporting-arm provided with a saw bearingthereon at one end, and means for mounting said arm upon said dog topermit the reversal of the arm to bring the sawbearing either above orbelow the dog.

2. An undercutter-support comprising a dog adapted for insertion in thematerial to be sawed, a supporting-arm provided at one end with asaw-bearing, and means for mounting said arm upon said dog to permit theadjustment and reversal of the arm and bearing relative to the dog.

3. An underoutter-support comprising a dog adapted for insertion in thematerial to be sawed, a supporting-arm provided at one end with asaw-bearing, and clamping means for supporting said arm at one side ofsaid dog to permit its reversal and adjustment without interference withthe dog.

4. An undercutter-support comprising a dog, a supporting-arm mountedthereon for vertical adjustment and provided at one end with asaw-bearing, a supporting-bolt through which said arm passes, and aclamping-washer -mounted upon said bolt and provided with a recessedface to engage one side of said arm.

5. An undercutter-support comprising a dog, a supporting-arm mountedthereon for vertical adjustment and provided at one end with asaw-bearing, a supporting-bolt through which said arm passes, aclamping-washer mounted upon said bolt and provided with a recessed faceto engage one side of said arm, an extended threaded shank from saidbolt, a cooperating washer mounted upon said shank to engage theclamping-washer and provided upon one face with a recess to seat uponsaid dog, and a holding-nut mounted upon the shank of thesupporting-bolt at the opposite side of the dog from said washers.

6. In a undercutter-support, a dog having an aperture at its outer end,a supportingbolt having a threaded shank extending through saidaperture, a supporting-arm adjustably carried by said bolt, means forclamping said arm and bolt to said dog, and a supporting-roller disposedupon a laterallyextending lug at one end of said arm.

7. In an undercutter-support, a supporting member, an arm carriedthereby and provided with a saw-bearing, a clamping-bolt through whichsaid arm passes, aclampingwasher mounted upon said bolt and providedupon one face with a recess to receive a portion of said arm and uponits oppositeface with a beveled clamping-seat, a cooperating washerhaving a beveled face to enter said seat, and means for clamping saidwashers together.

8. In an undercutter-support, a support FRANK H. LAMB.

Witnesses:

R. E. DAWBY, L. B. CARTER.

